[Rust/2022/23] Add solution
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6 changed files with 250 additions and 2 deletions
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# AdventOfCode
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[Advent of Code](https://adventofcode.com/) solutions in [<img height=12 src=".assets/rs.svg"> Rust](Rust), [<img height=12 src=".assets/hs.svg"> Haskell](Haskell), [<img height=12 src=".assets/py.svg"> Python](Python) and [<img height=12 src=".assets/apl.svg"> APL](APL)
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## [2022](https://adventofcode.com/2022) ([<img height=18 src=".assets/rs.svg"> Rust](Rust/2022): 23/25 | [<img height=18 src=".assets/py.svg"> Python](Python/2022): 18/25 | [<img height=18 src=".assets/hs.svg"> Haskell](Haskell/2022): 9/25)
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## [2022](https://adventofcode.com/2022) ([<img height=18 src=".assets/rs.svg"> Rust](Rust/2022): 24/25 | [<img height=18 src=".assets/py.svg"> Python](Python/2022): 18/25 | [<img height=18 src=".assets/hs.svg"> Haskell](Haskell/2022): 9/25)
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|Mo|Tu|We|Th|Fr|Sa|Su|
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|-|-|-|-|-|-|-|
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||||[**1**](https://adventofcode.com/2022/day/1) [<img height=12 src=".assets/rs.svg">](Rust/2022/01.rs "Rust solution for 2022/01") [<img height=12 src=".assets/hs.svg">](Haskell/2022/01.hs "Haskell solution for 2022/01") [<img height=12 src=".assets/py.svg">](Python/2022/01.py "Python solution for 2022/01")|[**2**](https://adventofcode.com/2022/day/2) [<img height=12 src=".assets/rs.svg">](Rust/2022/02.rs "Rust solution for 2022/02") [<img height=12 src=".assets/hs.svg">](Haskell/2022/02.hs "Haskell solution for 2022/02") [<img height=12 src=".assets/py.svg">](Python/2022/02.py "Python solution for 2022/02")|[**3**](https://adventofcode.com/2022/day/3) [<img height=12 src=".assets/rs.svg">](Rust/2022/03.rs "Rust solution for 2022/03") [<img height=12 src=".assets/hs.svg">](Haskell/2022/03.hs "Haskell solution for 2022/03") [<img height=12 src=".assets/py.svg">](Python/2022/03.py "Python solution for 2022/03")|[**4**](https://adventofcode.com/2022/day/4) [<img height=12 src=".assets/rs.svg">](Rust/2022/04.rs "Rust solution for 2022/04") [<img height=12 src=".assets/hs.svg">](Haskell/2022/04.hs "Haskell solution for 2022/04") [<img height=12 src=".assets/py.svg">](Python/2022/04.py "Python solution for 2022/04")|
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|[**5**](https://adventofcode.com/2022/day/5) [<img height=12 src=".assets/rs.svg">](Rust/2022/05.rs "Rust solution for 2022/05") [<img height=12 src=".assets/hs.svg">](Haskell/2022/05.hs "Haskell solution for 2022/05") [<img height=12 src=".assets/py.svg">](Python/2022/05.py "Python solution for 2022/05")|[**6**](https://adventofcode.com/2022/day/6) [<img height=12 src=".assets/rs.svg">](Rust/2022/06.rs "Rust solution for 2022/06") [<img height=12 src=".assets/hs.svg">](Haskell/2022/06.hs "Haskell solution for 2022/06") [<img height=12 src=".assets/py.svg">](Python/2022/06.py "Python solution for 2022/06")|[**7**](https://adventofcode.com/2022/day/7) [<img height=12 src=".assets/rs.svg">](Rust/2022/07.rs "Rust solution for 2022/07") [<img height=12 src=".assets/hs.svg">](Haskell/2022/07.hs "Haskell solution for 2022/07") [<img height=12 src=".assets/py.svg">](Python/2022/07.py "Python solution for 2022/07")|[**8**](https://adventofcode.com/2022/day/8) [<img height=12 src=".assets/rs.svg">](Rust/2022/08.rs "Rust solution for 2022/08") [<img height=12 src=".assets/hs.svg">](Haskell/2022/08.hs "Haskell solution for 2022/08") [<img height=12 src=".assets/py.svg">](Python/2022/08.py "Python solution for 2022/08")|[**9**](https://adventofcode.com/2022/day/9) [<img height=12 src=".assets/rs.svg">](Rust/2022/09.rs "Rust solution for 2022/09") [<img height=12 src=".assets/hs.svg">](Haskell/2022/09.hs "Haskell solution for 2022/09") [<img height=12 src=".assets/py.svg">](Python/2022/09.py "Python solution for 2022/09")|[**10**](https://adventofcode.com/2022/day/10) [<img height=12 src=".assets/rs.svg">](Rust/2022/10.rs "Rust solution for 2022/10") [<img height=12 src=".assets/py.svg">](Python/2022/10.py "Python solution for 2022/10")|[**11**](https://adventofcode.com/2022/day/11) [<img height=12 src=".assets/rs.svg">](Rust/2022/11.rs "Rust solution for 2022/11") [<img height=12 src=".assets/py.svg">](Python/2022/11.py "Python solution for 2022/11")|
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|[**12**](https://adventofcode.com/2022/day/12) [<img height=12 src=".assets/rs.svg">](Rust/2022/12.rs "Rust solution for 2022/12") [<img height=12 src=".assets/py.svg">](Python/2022/12.py "Python solution for 2022/12")|[**13**](https://adventofcode.com/2022/day/13) [<img height=12 src=".assets/rs.svg">](Rust/2022/13.rs "Rust solution for 2022/13") [<img height=12 src=".assets/py.svg">](Python/2022/13.py "Python solution for 2022/13")|[**14**](https://adventofcode.com/2022/day/14) [<img height=12 src=".assets/rs.svg">](Rust/2022/14.rs "Rust solution for 2022/14") [<img height=12 src=".assets/py.svg">](Python/2022/14.py "Python solution for 2022/14")|[**15**](https://adventofcode.com/2022/day/15) [<img height=12 src=".assets/rs.svg">](Rust/2022/15.rs "Rust solution for 2022/15") [<img height=12 src=".assets/py.svg">](Python/2022/15.py "Python solution for 2022/15")|[**16**](https://adventofcode.com/2022/day/16) [<img height=12 src=".assets/rs.svg">](Rust/2022/16.rs "Rust solution for 2022/16") [<img height=12 src=".assets/py.svg">](Python/2022/16.py "Python solution for 2022/16")|[**17**](https://adventofcode.com/2022/day/17) [<img height=12 src=".assets/rs.svg">](Rust/2022/17.rs "Rust solution for 2022/17") [<img height=12 src=".assets/py.svg">](Python/2022/17.py "Python solution for 2022/17")|[**18**](https://adventofcode.com/2022/day/18) [<img height=12 src=".assets/rs.svg">](Rust/2022/18.rs "Rust solution for 2022/18") [<img height=12 src=".assets/py.svg">](Python/2022/18.py "Python solution for 2022/18")|
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|[**19**](https://adventofcode.com/2022/day/19) [<img height=12 src=".assets/rs.svg">](Rust/2022/19.rs "Rust solution for 2022/19")|[**20**](https://adventofcode.com/2022/day/20) [<img height=12 src=".assets/rs.svg">](Rust/2022/20.rs "Rust solution for 2022/20")|[**21**](https://adventofcode.com/2022/day/21) [<img height=12 src=".assets/rs.svg">](Rust/2022/21.rs "Rust solution for 2022/21")|[**22**](https://adventofcode.com/2022/day/22) [<img height=12 src=".assets/rs.svg">](Rust/2022/22.rs "Rust solution for 2022/22")|[**23**](https://adventofcode.com/2022/day/23)|[**24**](https://adventofcode.com/2022/day/24)|[**25**](https://adventofcode.com/2022/day/25) [<img height=12 src=".assets/rs.svg">](Rust/2022/25.rs "Rust solution for 2022/25")|
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|[**19**](https://adventofcode.com/2022/day/19) [<img height=12 src=".assets/rs.svg">](Rust/2022/19.rs "Rust solution for 2022/19")|[**20**](https://adventofcode.com/2022/day/20) [<img height=12 src=".assets/rs.svg">](Rust/2022/20.rs "Rust solution for 2022/20")|[**21**](https://adventofcode.com/2022/day/21) [<img height=12 src=".assets/rs.svg">](Rust/2022/21.rs "Rust solution for 2022/21")|[**22**](https://adventofcode.com/2022/day/22) [<img height=12 src=".assets/rs.svg">](Rust/2022/22.rs "Rust solution for 2022/22")|[**23**](https://adventofcode.com/2022/day/23) [<img height=12 src=".assets/rs.svg">](Rust/2022/23.rs "Rust solution for 2022/23")|[**24**](https://adventofcode.com/2022/day/24)|[**25**](https://adventofcode.com/2022/day/25) [<img height=12 src=".assets/rs.svg">](Rust/2022/25.rs "Rust solution for 2022/25")|
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## [2021](https://adventofcode.com/2021) ([<img height=18 src=".assets/rs.svg"> Rust](Rust/2021): 25/25 | [<img height=18 src=".assets/py.svg"> Python](Python/2021): 25/25 | [<img height=18 src=".assets/apl.svg"> APL](APL/2021): 17/25)
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236
Rust/2022/23.rs
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236
Rust/2022/23.rs
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#![feature(test)]
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use std::ops::Add;
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type Input = Vec<Position>;
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fn setup(input: &str) -> Input {
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input
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.lines()
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.enumerate()
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.flat_map(|(i, line)| {
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line.chars().enumerate().filter_map(move |(j, c)| {
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(c == '#').then_some(Position::from_coords(j as _, i as _))
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})
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})
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.collect()
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}
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const SIZE: u16 = 256;
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const OFFSET: u16 = 16;
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type PositionType = u16;
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type BucketType = usize;
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const BUCKET_COUNT: usize = (1 << PositionType::BITS as usize) / BUCKET_SIZE;
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const BUCKET_SIZE: usize = BucketType::BITS as usize;
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const DIRECTIONS: [Direction; 4] = [
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Direction::North,
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Direction::South,
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Direction::West,
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Direction::East,
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];
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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struct Position(PositionType);
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#[derive(Debug, Clone)]
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struct PositionSet([BucketType; BUCKET_COUNT]);
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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enum Direction {
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North,
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East,
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South,
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West,
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}
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impl Add<Direction> for Position {
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type Output = Self;
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fn add(self, rhs: Direction) -> Self::Output {
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match rhs {
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Direction::North => Self(self.0 - SIZE),
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Direction::East => Self(self.0 + 1),
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Direction::South => Self(self.0 + SIZE),
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Direction::West => Self(self.0 - 1),
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}
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}
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}
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impl Direction {
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fn rotate_left(self) -> Self {
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match self {
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Self::North => Self::West,
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Self::East => Self::North,
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Self::South => Self::East,
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Self::West => Self::South,
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}
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}
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fn rotate_right(self) -> Self {
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match self {
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Self::North => Self::East,
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Self::East => Self::South,
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Self::South => Self::West,
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Self::West => Self::North,
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}
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}
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}
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impl Position {
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fn from_coords(x: PositionType, y: PositionType) -> Self {
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Self((y + OFFSET) * SIZE + x + OFFSET)
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}
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fn coords(self) -> (PositionType, PositionType) {
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(self.0 % SIZE, self.0 / SIZE)
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}
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fn neighbors(self) -> [Position; 8] {
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[
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Self(self.0 - SIZE - 1),
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Self(self.0 - SIZE),
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Self(self.0 - SIZE + 1),
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Self(self.0 - 1),
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Self(self.0 + 1),
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Self(self.0 + SIZE - 1),
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Self(self.0 + SIZE),
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Self(self.0 + SIZE + 1),
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]
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}
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}
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impl FromIterator<Position> for PositionSet {
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fn from_iter<T: IntoIterator<Item = Position>>(iter: T) -> Self {
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let mut out = Self::default();
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for p in iter {
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out.insert(p);
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}
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out
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}
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}
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impl Default for PositionSet {
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fn default() -> Self {
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Self([0; BUCKET_COUNT])
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}
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}
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impl PositionSet {
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fn contains(&self, p: Position) -> bool {
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self.0[p.0 as usize / BUCKET_SIZE] & (1 << (p.0 % BUCKET_SIZE as u16)) != 0
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}
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fn remove(&mut self, p: Position) {
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self.0[p.0 as usize / BUCKET_SIZE] &= !(1 << (p.0 % BUCKET_SIZE as u16));
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}
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fn insert(&mut self, p: Position) {
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self.0[p.0 as usize / BUCKET_SIZE] |= 1 << (p.0 % BUCKET_SIZE as u16);
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}
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fn toggle(&mut self, p: Position) {
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self.0[p.0 as usize / BUCKET_SIZE] ^= 1 << (p.0 % BUCKET_SIZE as u16);
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}
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}
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#[derive(Debug)]
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struct State {
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positions: Vec<Position>,
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proposed: Vec<Position>,
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occupied: PositionSet,
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cnt: usize,
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}
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impl State {
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fn from_input(input: &Input) -> Self {
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let positions = input.clone();
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let occupied = input.iter().copied().collect();
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Self {
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proposed: positions.clone(),
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positions,
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occupied,
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cnt: 0,
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}
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}
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fn size(&self) -> (usize, usize) {
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let (x, y) = self.positions[0].coords();
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let (x1, y1, x2, y2) = self
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.positions
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.iter()
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.fold((x, y, x, y), |(x1, y1, x2, y2), p| {
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let (x, y) = p.coords();
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(x1.min(x), y1.min(y), x2.max(x), y2.max(y))
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});
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((x2 - x1 + 1) as _, (y2 - y1 + 1) as _)
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}
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fn empty_tiles(&self) -> usize {
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let (w, h) = self.size();
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w * h - self.positions.len()
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}
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fn simulate(&mut self) -> bool {
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let mut proposed_set = PositionSet::default();
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self.positions
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.iter()
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.enumerate()
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.filter_map(|(i, &p)| {
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if !p.neighbors().into_iter().any(|q| self.occupied.contains(q)) {
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return None;
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}
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let d = (0..4)
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.map(|di| DIRECTIONS[(di + self.cnt) % 4])
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.find(|&d| {
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!self.occupied.contains(p + d)
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&& !self.occupied.contains(p + d + d.rotate_left())
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&& !self.occupied.contains(p + d + d.rotate_right())
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})?;
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Some((i, p + d))
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})
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.for_each(|(i, q)| {
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proposed_set.toggle(q);
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self.proposed[i] = q;
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});
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let mut moved = false;
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self.positions
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.iter_mut()
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.zip(self.proposed.iter_mut())
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.for_each(|(p, q)| {
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if !proposed_set.contains(*q) {
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*q = *p;
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} else {
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self.occupied.remove(*p);
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self.occupied.insert(*q);
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*p = *q;
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moved = true;
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}
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});
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self.cnt += 1;
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moved
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}
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}
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fn part1(input: &Input) -> usize {
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let mut state = State::from_input(input);
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for _ in 0..10 {
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state.simulate();
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}
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state.empty_tiles()
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}
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fn part2(input: &Input) -> usize {
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let mut out = 1;
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let mut state = State::from_input(input);
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while state.simulate() {
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out += 1;
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}
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out
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}
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aoc::main!(2022, 23, ex: 1);
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@ -193,5 +193,8 @@ path = "2022/21.rs"
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name = "2022_22"
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path = "2022/22.rs"
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[[bin]]
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name = "2022_23"
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path = "2022/23.rs"
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[[bin]]
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name = "2022_25"
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path = "2022/25.rs"
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7
examples/2022/23/1
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7
examples/2022/23/1
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....#..
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..###.#
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#...#.#
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.#...##
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#.###..
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##.#.##
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.#..#..
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1
examples/2022/23/1.1
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1
examples/2022/23/1.1
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110
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1
examples/2022/23/1.2
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1
examples/2022/23/1.2
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@ -0,0 +1 @@
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20
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